FILTER PRESSES machines
FILTER PRESSES machines
A filter comprises a set of vertical, juxtaposed recessed plates, presses against each other by hydraulic jacks at one end of the set. The pressure applied to the joint face of each filtering plate must withstand the chamber internal pressure developed by the sludge pumping system.
This vertical plate layout forms watertight filtration chambers allowing easy mechanisation for the discharge of cakes. Filter chlotes finely or tightly meshed are applied to the two groowed surfaces in these plates.
Orifices feed the sludge to be filtered under pressure in the filtration chamber. They are usually placed in the center of the plates allowing a proper distribution of flow, right pressure and better drainage of sludge within the chamber. Solids sludge gradually accumulates in the filtration chamber until the final compacted cake is formed. The filtrate is collected at the back of the filtration support and carried away
Technical Feature
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The production capacity of a filter press is somewhere between 1.5 and 10 kg of solid per m2 of filtering surface. For every the filter press model the chamber volume and the filtering surface depend on the number of plates in the filer.
In practical terms pressing times are less then four hours.
Filtration time depends on:– cake thikness
– sludge concentration
– specific resistance
– compressibility coefficient.
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Product performance
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The filter press is suitable for almost all types of sludge:
- Hydrophilic organic sludge: inorganic conditioning is often recommended to enable satisfactory cake release due to minimal aderence to filter cloth.
- Hydrophilic inorganic sludge: the filer press generally requires the addition of lime only.
- Hydrophobic inorganic sludge: it is very dense and ideal for the filter press. It is dewatered without any preliminary conditioning.
- Oily sludge: the filter press can be used to treat sludge containing light oils, the presence of grease can sometimes impair the smooth running of the filter; clothes have to be degreased at frequent intervals.